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    Galaxies Galaxies Presentation Transcript

    • Galaxies By- Paige Mertens By- Paige Mertens
    • Galaxies
      • A galaxy is a large grouping of
      • stars, dust, and gas.
    • Galaxies
      • There are billions of galaxies in the universe.
      • They come in many shape and sizes. Size is based on the number of stars in the galaxy.
      • Throughout the known universe, galaxies are found in groups called clusters.
    • Galaxies
      • Galaxies are divided into three main categories:
        • Spiral
        • Elliptical
        • Irregular
    • Spiral Galaxies
      • Looks like a flat disk with spiral arms made of gas, dust, with a bulge in the center.
      • New stars are formed inside the more dense areas of gas and dust.
      • People tend to think of spiral galaxies more than any other type of galaxy.
    • Elliptical Galaxies
      • Round, oval-like or “blob-shaped” mass of stars.
      • Have a bright center, and have very little dust or gas. This means no new stars are forming.
      • Thought to be the older galaxies, as they contain older stars.
    • Elliptical Galaxies
      • In a cluster of galaxies, about 50% are elliptical.
      • The biggest galaxies are giant elliptical galaxies. They contain at least one trillion stars, and have the width of twenty million light-years.
    • Irregular Galaxies
      • Appear to be neither round or flat.
      • Can be several different colors.
      • Their stars, gases, and dust are spread out in random ways.
    • Irregular Galaxies
      • Smallest galaxies in the universe.
      • Contain less than one millions stars.
      • There are many small irregular galaxies orbiting the Milky Way Galaxy.
    • Comparing the Galaxies Spiral Elliptical Irregular Shape Flat disk Round Oval-like Blob Varies Size Average Large Small Stage Middle Oldest Newest
    • The Hubble Space Telescope
      • Named after Edwin Hubble, an astronomer who began to classify galaxies by their shapes around the 1920’s.
      • Hubble was launched in 1990, and is one of NASA’s longest lasting missions.
      • Thanks to this telescope, scientist have been able to further sub-classify the galaxies:
        • Spiral- 8
        • Elliptical- 3
        • Irregular- 2
    • The Milky Way
      • We live in the Milky Way.
      • When compared to other galaxies, the Milky Way has similar characteristics to a Spiral.
      • After further investigation, astronomers believe the Milky Galaxy is a Barred Spiral Galaxy.
        • Gas, dust, and stars make it difficult for astronomers to evaluate our galaxy.
    • Source
      • &quot;galaxies.&quot; cas.sdss.org. 28 January 2011 <http://cas.sdss.org/dr4/en/astro/galaxies/galaxies.asp>.
      • &quot;hubble telescope.&quot; hubblesite.org. 27 January 2011 http://hubblesite.org/the_telescope/hubble_essentials/ .
      • Knight, J.D. &quot;galaxies types.&quot; seashy.org. 26 January 2011 <http://www.seasky.org/celestial-objects/galaxies.html>.
      • &quot;milky way.&quot; 7 January 2011. wikipedia. 28 January 2011 <http://en.wikipedia.org/wiki/Milky_Way >.
      • Strobel, Nick. &quot;types of galaxies.&quot; 17 June 2002. astronomynotes.com. 29 January 2011 <http://www.astronomynotes.com/galaxy/s3.htm >.